The 35-year-old Swiss star wins his eighth Wimbledon and 19th career Grand Slam title. His artistry and his elegant, courtly manner cover up what an efficient killer he is on the court.

LONDON—In the end, perhaps as it should have been, it was more of a coronation than a competition as Roger Federer dismantled Marin Cilic to win his 19th Grand Slam title with England’s future king watching from Centre Court’s royal box.

Federer’s 6-3, 6-1, 6-4 win, which came just three weeks before his 36th birthday, was arguably the most remarkable of his storied career. He didn’t drop a set in seven matches. The dominating performance, gives him a second Slam title in 2017—he won the Australian Open in January—and comes...